Henry's mother Mary Peabody (maiden name could be Pincumbe) worked in Detroit Michigan as a teen and became pregnant. She return to Canada and had Henry when she was 19 years old. She was not married at the time.
She them married Thomas Peabody. The 1880 census has Thomas and Mary Peabody living in Clinton County near Lansing Michigan.

The censuses of 1851 and 1871 list a John Pinkham living with Thomas and Mary Peabody. This could be Mary's father.

Henry Pincumbe's lastname was Peabody in the 1851 census and by the 1870 census he had changed it to Pincumbe. Henry names his first child, John Pincumbe, possibly after the John Pinkham in the 1851 and 1871 censuses.

Henry's son Elgin Pincumbe changed his name to Peabody after living with his Grandmother, Mary Peabody near Lansing Michigan.

The scanned census images are large jpg's, 100,000 to 200,000 bytes each.